Re: JVM on i-Series

["Sacha Boer" <sachaboer@xxxxxxxxx>]

Thanks for your tips, Vern.

I'll look in to them and ptdv is dowloading as i'm typing.

Sacha

2006/3/14, Vernon Hamberg <vhamberg@xxxxxxxxxxx>:
> There is a startup cost every time you fire up the JVM. Using a
> never-ending-program (NEP) job is a good solution, IMO. A service
> program won't do what you think, as far as I know, because that will
> still be run separately in each job.
>
> Threads in pools are sort of like what we used to think of as jobs.
> Esp. when talking about max active - this is threads, not jobs as
> such. Have you looked at the Work Management book lately?
>
> You might go to www.iseries.ibm.com/support and click on the Search
> button. Then search on JVM and performance or some such - I know
> there are some articles from IBM on making the JVM perform better,
> generally speaking.
>
> There is also a site www.iseries.ibm.com/perfmgmt that might have
> something - I looked but did not find much right away - there is a
> tool there called PTDV that is good for analyzing Java performance data.
>
> HTH
> Vern
>
> At 03:17 AM 3/14/2006, you wrote:
>
> >Hi all,
> >
> >do any of you have experience with java on the iSeries?
> >
> >Currently I'm confronted with Java calls from done by an ILE program.
> >For each interactive session, a JVM is started with 20 threads. This
> >results in a regular load of 400 to 600 JVM's, which creates an
> >enormous load on the machine both in memory and in CPU load.
> >
> >I would think along the lines of a serviceprogram which maintains 1
> >JVM, which is used by interactive sessions by means of dataq or
> >something like that.
> >
> >Secondly.........can anyone direct me to some documentation which
> >specifically covers the subject of the JVM on iSeries? I would like to
> >read more on how to balance max act threads defined in the pool versus
> >number of JVM's etc.
> >
> >TIA
> >Sacha
> >
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